ext4: sync up block group descriptor with e2fsprogs.
This patch extends bg_itable_unused of ext4 group descriptor from 16bit into 32bit. In order to add bg_itable_unused_hi into struct ext4_group_desc, some extra fields which are already introduced into e2fsprogs are also added in for consistency. Signed-off-by: NColy Li <coyli@suse.de> Cc: Andreas Dilger <adilger@clusterfs.com> Signed-off-by: NMingming Cao <cmm@us.ibm.com>
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